I invite you to get acquainted with our Good to know before you start wiki page, where the reason and logic behind the 'Due Date' being mandatory is thoroughly explained.
Feel free to ask more questions, in case any further clarification is required.
@vítor mourão i don't know if butler alone would work because i don't think you can apply rules retroactively, but you could create a new label called "remove due date", make a butler rule to remove the due date from any cards with that label, and THEN use the Bulk Actions Power-Up to apply that label to all the cards on your board.
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